单选题：Why are researches on parrots important according to the pas

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题目内容：
Why are researches on parrots important according to the passage? （　　）
A. The Trust shows great concern for the programme.
B. We need to knows more about how to preserve parrots
C. Many people are interested in collecting parrots.
D. Parrots’ intelligence may some day benefit people.
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